Photographic-printing apparatus.



PATENTED MAR. 24, 1908.

B. HALL. PHOTOGRAPHIG PRINTING APPARATUS.

APPLICATION FILED mums. 1907.

w/mEssss Til: NORRIS Psrtn; 0a., WASHINGTON. 1:. c

UNITED STATES P TENT OFFICE.

BENJAMIN JAMES HALL, OF BARNES, ENGLAND.

PHOTOGRAPHIC-PRINTING APPARATUS.

Application filed June 19, 1907.

To all whom it may concern:

Be it known that I, BENJAMIN JAMEs HALL, a subject of the King of Great Britain, and residing at Barnes, 1n the county of Surrey, England, have invented certain new and useful Improvements in Photographic- Printing Apparatus, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in apparatus for photo-printing of the type in which the tracing and photo paper are passed continuously over a glass plate, the other side of which is illuminated by daylight 'or by artificial light; and the object of my invention is to provide a contact between the sensitized paper, .tracing and glass plate, thereby securing sharp definition, and at the same time dispense with the traveling bands or aprons which are found so troublesome in use.

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of my improvement are designated by suitable reference characters in each of the views, and in which Figure 1 is a partial elevation view of an apparatus of the class specified constructed according to my invention; Fig. 2 a partial side view thereof; and, Fig. 3 a sectional side view.

In the accompanying drawing only sufficient of the framework and apparatus are shown to illustrate my improvement, and in carrying my invention into effect, I employ a drum (1 which is mounted. in a frame I) of the usual form, and said drum is ada ted to be operated by hand or by power, ut in the accompanying drawing, I have shown at a a gearing connected. with one end of the shaft of the drum a and operating in connection with a worm gear shaft a provided at one end with a stepped pulley a", and in practice, any suitable power device may be geared in connection with the stepped pulley a" by means of a belt. The drum or is provided with a felt or other flexible cover a and placed rearwardly of the drum and supported, in practice, in the frame I), or in any preferred manner, is a glass plate 0 which is curved to cor respond with the curve of the drum.

The glass plate 0 may be semi-cylindrical in form or it may be less than the half of a cylinder in dimensions, and if less than the Specification of Letters Patent.

Patented. March 24, 1908.

Serial No. 379,690. I

half of a cylinder in dimensions wooden plates 0 are employed to complete the half of the cylinder or the half of the circumference of the drum, and said wooden plates, if employed, are also secured in the frame I) in any desired manner and these wooden plates, when employed, serve as guides for the tracing and photographic paper as the latter is carried around by the drum.

In practice, the convex surface of the glass is illuminated by daylight or by artificial light in the usual manner, and when printing by artificial light economy may be effected by placing two such photo-prin ting apparatus in juxtaposition with an electric arc lamp or lamps or other illuminating devices between them. In such cases the drums may be geared together and driven from one source or may be operated independently.

Placed over the top front portion of the drum is a table d supported by the frame I) and over which the tracing and photographic paper are fed, in the operation of the apparatus, and directly over the central portion of the drum is preferably placed a roller e, and the tracing and photographic aper are fed over the table d beneath the rol er e from which they pass between the glass late 0 and the drum a, or if the pieces 0 of wood are employed, the said tracing and photographic paper first passes beneath the top piece 0 which also may be provided with a roller. At the bottom of the drum is placed another table f and the tracing and photographic paper after passing between the glass plate 0 and the drum pass out onto the table f. The friction between the glass and the tracing paper being less than that between the drum and the said tracing and photographic paper there is no relative movement between the tracing and photographic paper while in contact with the drum and glass plate, and the drum carries the tracing and photographic paper around with it as will be readily understood, this operation being facilitated by the felt or other flexible cover a on the drum.

It will be understood that I have not shown all the details of the construction of the frame nor the details of the apparatus for supporting electric or other lights when they are employed as they form no part of my invention, the latter being limited to the applica tion of the glass plate 0 to a machine or apparatus of this class as usually constructed.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a photographic printing apparatus, a rotary drum provided with a fibrous cover, and a curved glass plate mounted adjacent to one side thereof.

2. In a photographic printing apparatus, a frame, a rotatable drum mounted therein, a curved glass plate partly inclosing said drum and arranged adjacent thereto, and means for feeding a flexible sheet between said plate and said drum.

3. In a photographic printing a paratus, a frame, a rotatable drum mounte therein,

a curved glass plate artly inclosing said drum and arranged adjacent thereto, and means for feeding 'a flexible sheet between said plate and said drum, said drum being also provided with a felt or other flexible cover.

In testimony that I claim the foregoing as my invention I have signed my name in presence of the subscribing witnesses this 5th day of June, 1907.

BENJAMIN JAMES HALL.

Witnesses:

H. D. JAMESON, I R. F. WILLIAMS. 

